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| author | Jason Wang | 2013-07-10 07:43:28 +0200 |
|---|---|---|
| committer | David S. Miller | 2013-07-11 03:45:52 +0200 |
| commit | 61d46bf979d5cd7c164709a80ad5676a35494aae (patch) | |
| tree | c7054c34dacaa95f2e4b63c61baf8227deab7581 /drivers/net/ethernet/renesas/Kconfig | |
| parent | tuntap: correctly linearize skb when zerocopy is used (diff) | |
| download | kernel-qcow2-linux-61d46bf979d5cd7c164709a80ad5676a35494aae.tar.gz kernel-qcow2-linux-61d46bf979d5cd7c164709a80ad5676a35494aae.tar.xz kernel-qcow2-linux-61d46bf979d5cd7c164709a80ad5676a35494aae.zip | |
macvtap: correctly linearize skb when zerocopy is used
Userspace may produce vectors greater than MAX_SKB_FRAGS. When we try to
linearize parts of the skb to let the rest of iov to be fit in
the frags, we need count copylen into linear when calling macvtap_alloc_skb()
instead of partly counting it into data_len. Since this breaks
zerocopy_sg_from_iovec() since its inner counter assumes nr_frags should
be zero at beginning. This cause nr_frags to be increased wrongly without
setting the correct frags.
This bug were introduced from b92946e2919134ebe2a4083e4302236295ea2a73
(macvtap: zerocopy: validate vectors before building skb).
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/renesas/Kconfig')
0 files changed, 0 insertions, 0 deletions